Power lithium battery cascade reutilization scene screening method

Abstract

The invention discloses a power lithium battery cascade reutilization scene screening method based on application scene data collection. In view of the problems that retired lithium batteries are in an off-line state and performance differences exist among single batteries, ohmic internal resistance of a lithium battery is used as a basic parameter, a performance test working condition suitable for cascade utilization of the lithium battery is designed, the method is based on a lithium battery first-order RC equivalent circuit model, a health characteristic data extraction means based on an incremental autoregressive model (I-ARX) is designed, three health factors of mean internal resistance, minimum internal resistance and internal resistance state of charge (SOC) are constructed, a health life model is established, and a lithium battery SOH detection method based on a multi-model data fusion technology is provided. On the premise of not depending on instant contact measurement whichpossibly damages the internal structure of the battery, the problems of large screening difficulty of cascade reutilization power batteries, long detection period and reutilization economic benefit upside down caused by mismatching of complexity of an energy storage system and a power system of the current power lithium batteries are solved.

Description

technical field [0001] The invention relates to the technical field of cascade utilization of power lithium batteries, in particular to a method for screening power lithium battery cascade reuse scenarios based on application scenario data collection. Background technique [0002] The recycling of power batteries is mainly divided into two cycle processes: cascade utilization and dismantling and recycling, and the recycling cycle of power batteries starts from cascade utilization. Dismantling and recycling refers to the crushing, dismantling and smelting of power batteries that have been completely scrapped, so as to realize the recycling of resources such as nickel, cobalt and lithium. The life cycle of power batteries generally includes production, use, scrapping, decomposition and reuse. After the battery capacity of the vehicle power battery is reduced to 80%, its charge and discharge performance will not meet the requirements of the car, and it needs to be scrapped. Ex...

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Problems solved by technology

Such a connection structure makes the cascade utilization of power batteries difficult, and the cost for users to reassemble old batteries into battery packs is too high, which hinders the cascade utilization of power batteries

[0004] Secondly, the cascade utilization of power lithium batteries is also relatively complicated. The quality of decommissioned batteries varies, and many problems such as safety, consistency, technicality, and economy need to be solved.

[0005] Finally, energy storage batteries and power batteries used in cascade utilization have different concerns in terms of technical performance, and the complexity of the systems faced by energy storage systems and power systems is different. Especially after long-term use, the consistency of batteries is nonlinear. The decline makes the use of power cascade batteries more similar to false propositions, and a large number of screening work for batteries with different consistency also makes the economy of power lithium batteries used in cascades questioned by the industry

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